function formatNumber (n) {
    const str = n.toString()
    return str[1] ? str : `0${str}`
  }
  
  const formatTime = (date)=>{
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
  
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
  
    const t1 = [year, month, day].map(formatNumber).join('-')
    const t2 = [hour, minute, second].map(formatNumber).join(':')
  
    return `${t1} ${t2}`
  }
  function formatDate(date){
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
  
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
  
    const t1 = [year, month, day].map(formatNumber).join('-')
    return `${t1}`
  }
  export  {
    formatNumber,
    formatTime,
    formatDate
  }
  